CN115184729B - Simulation system and method for automatically detecting and processing intermittent arc ground faults - Google Patents
Simulation system and method for automatically detecting and processing intermittent arc ground faults Download PDFInfo
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Abstract
The invention discloses a simulation system and a simulation method for automatically detecting and processing intermittent arc ground faults, wherein the system comprises the following components: the fault simulation device is used for controlling the switches to simulate the occurrence and disappearance of intermittent arc ground faults through the remote control device; the data detection device is used for detecting zero sequence voltage and phase current signals generated when the fault simulation device simulates the intermittent arc ground fault, filtering the zero sequence voltage and phase current signals according to transient frequency in the intermittent arc, and judging the ground fault after obtaining corresponding transient quantity; and the fault processing device is used for processing the intermittent arc grounding fault by adopting the small-resistance grounding device and the arc suppression coil grounding device which are connected in parallel. The invention simulates intermittent arc grounding faults, determines faults through an automatic detection method of single-phase grounding faults of a power system and solves the faults by adopting a logic method for processing the intermittent arc grounding faults.
Description
Technical Field
The invention belongs to the technical field of ground faults of power systems, and relates to a simulation system and a simulation method for automatically detecting and processing intermittent arc ground faults.
Background
With the rapid development of economy and society and the continuous improvement of the quality of a national power grid, the requirements on reliability and economy in the working process of a power system are further enhanced, and one important solution is to reduce the occurrence of power distribution network faults. Under the support of economic growth, in recent years, the development of the power system in China is more and more rapid, the utilization rate of the cable lines is gradually increased all over the country, and the failure frequency is increased.
When a ground fault occurs in an underground cable circuit, an arc usually occurs along with the ground fault, and the ground fault is characterized by repeated extinction and re-ignition, the arc is temporarily extinguished at the moment when the current reaches the power frequency zero point, and when the phase voltage rises again, the arc also generates a re-ignition phenomenon. The difficulty of completely extinguishing the arc is relatively high, and for intermittent arc grounding faults, the voltage generated during faults exceeds about 2 times of the voltage during normal operation, and insulating mediums on the overvoltage line with the strength are easily broken down, so that the road gate on the line is damaged, other devices are damaged and deformed, and fire disasters can be caused.
At present, manual detection and treatment are adopted for intermittent arc grounding faults, so that manpower and material resources are consumed, meanwhile, the manual detection and treatment are easy to cause omission, and the safety of workers is difficult to guarantee. Therefore, a simulation system capable of automatically detecting and processing intermittent arc ground faults needs to be studied, the simulation of the whole process is carried out, a processing mechanism of sudden faults in actual work is further perfected, and the capacity of processing the ground faults of the power distribution network line is enhanced.
Disclosure of Invention
In order to solve the defects existing in the prior art, the invention aims to provide a simulation system and a simulation method for automatically detecting and processing intermittent arc grounding faults, which simulate the intermittent arc grounding faults, filter the zero sequence voltage and phase current signals according to transient frequency in the intermittent arc by detecting the zero sequence voltage and phase current signals generated when the intermittent arc grounding faults occur, judge the grounding faults after obtaining corresponding transient quantity, and process the intermittent grounding faults by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel.
In order to achieve the above object, the present invention adopts the following technical scheme:
a simulation system for automatically detecting and handling intermittent arc-to-ground faults, the simulation system comprising fault simulation means, fault handling means and data detection means;
the fault simulation device is used for controlling the switches to simulate the occurrence and disappearance of intermittent ground faults;
the data detection device is used for detecting zero sequence voltage, phase current signals and intermittent arcs generated when the fault simulation device simulates the intermittent arc ground faults, filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs, and judging the ground faults after obtaining corresponding transient quantities;
the fault processing device is used for processing the intermittent arc grounding fault by adopting the small-resistance grounding device and the arc suppression coil grounding device which are connected in parallel when the data detection device judges the intermittent arc grounding fault.
The invention further comprises the following preferable schemes:
preferably, the fault simulation device comprises an isolating switch, a control switch, a grounding switch, a protection resistor, a grounding fault device and a remote control device;
the head end of the protection resistor is connected with the tail end of the control switch;
one end of the ground fault device is grounded, and the other end of the ground fault device is connected with the tail end of the protection resistor;
the head end of the control switch is connected with the tail end of the isolating switch and the head end of the grounding switch;
the tail end of the grounding switch is grounded, and the head end of the isolating switch is connected with the data monitoring device;
the remote control device controls the opening and closing of the isolating switch, the control switch and the grounding switch to simulate the occurrence and disappearance of intermittent arc grounding faults.
Preferably, before the analog system operates, the switching state in the fault analog device is:
the isolating switch is in an open state, the control switch is in an open state, and the grounding switch is in a closed state, so that the tail end of the isolating switch is grounded.
Preferably, in the fault simulation device, when the intermittent arc ground fault is to be simulated, the remote control device is used as an initial action device to control the closing of the isolating switch, control the closing of the control switch and control the opening of the grounding switch so as to simulate the intermittent arc ground fault process;
when the intermittent arc grounding fault simulation process is completed, the remote control device controls the disconnecting switch to be opened, controls the control switch to be opened, and controls the grounding switch to be closed.
Preferably, in the fault handling device, the small resistance of the small-resistance grounding device is between 15 and 25 Ω.
The invention also provides a simulation method for automatically detecting and processing the intermittent arc ground fault, which comprises the following steps:
step 1, controlling a plurality of switches to simulate the occurrence and disappearance of intermittent ground faults;
and 2, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the intermittent arc grounding faults occur, carrying out filtering treatment on the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs, judging the grounding faults after obtaining corresponding transient components, and adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel to treat the intermittent arc grounding faults when the intermittent arc grounding faults are judged.
Preferably, in the step 2, the detection simulates a zero sequence voltage, a phase current signal and an intermittent arc generated when the intermittent arc ground fault occurs, and performs filtering processing on the zero sequence voltage and the phase current signal according to a transient component in the intermittent arc, so as to obtain a corresponding transient quantity, and then performs ground fault discrimination, which specifically includes:
step 21, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the simulated intermittent arc ground fault occurs in real time
Step 22, setting the filter frequency as AHz;
AHz is the frequency in the transient in the intermittent arc, which is the frequency contained in the transient after passing through the band pass filter;
step 23, filtering the zero sequence voltage and phase current signals by a filter, wherein the phase current passing through the filter only comprises the transient quantity appearing in the intermittent arc ground fault;
the zero sequence voltage transient amplitude value at the frequency point i after being processed by the filter is recorded as U mi The phase angle is noted as omega i I=1, 2, ·k, k is the number of frequency bins;
the transient amplitude of the phase current at the frequency point j after being processed by the filter is recorded as I mj The phase angle is noted as omega' j J=1, 2, ·k, k is the frequency point number;
step 24, taking y=c=j=i=1, 2,..k, and calculating and comparing the phase current transient quantity and the zero sequence voltage transient quantity corresponding to the frequency points i and j;
and step 25, judging the intermittent arc grounding fault according to the calculation and comparison results of the step 24, and transmitting a signal which is determined to be the intermittent arc grounding fault when judging the intermittent arc grounding fault.
Preferably, in step 24, taking y=c=j=i=1, 2, ·k, the phase current transient corresponding to the frequency points i, j is calculated and compared with the zero sequence voltage transient as follows:
calculating the phase angle omega of the transient quantity of the phase current and the transient quantity of the zero sequence voltage c ，ω c ＝ω’ j- ω i ；
Amplitude U of zero sequence voltage transient mi With a preset amplitude U' mi Comparing;
amplitude I of transient quantity of current mj With a preset amplitude I' mj Comparing;
by taking the difference omega of the phase angles c With a preset value omega y And (5) comparing.
Preferably, in step 25, if U appears in the calculation and comparison results of step 24 mi ＜U’ mi 、I mj ＜I’ mj Or omega c And if the arc-to-ground fault is within the preset range, judging that the intermittent arc-to-ground fault exists.
Preferably, in step 2, after receiving the signal determined to be an intermittent arc ground fault, the following steps are performed:
1) The arc suppression coil grounding device is connected to a main circuit where the grounding fault device is located, and the arc suppression coil grounding device is used for compensating the grounding capacitance current of the grounding fault device to limit the overvoltage of the system;
2) Continuously detecting signals when the intermittent arc grounding faults are simulated, if the signals determined to be the intermittent arc grounding faults disappear, namely, the intermittent arc grounding faults are considered to be absent, the simulation system resumes normal operation, otherwise, the simulation system indicates that the intermittent arc grounding faults still exist, the faults cannot be eliminated through compensation of the arc suppression coil grounding device, and then the small-resistance grounding device is introduced to eliminate the faults.
Preferably, in the step 2), when the intermittent arc grounding fault still exists and the fault cannot be eliminated by the arc suppression coil grounding device, the arc suppression coil grounding device is adopted to compensate the grounding power Rong Dianliu to suppress the overvoltage of the system, and then the small resistor grounding device is adopted to directly connect the small resistor with the bus, so that the grounding fault line, namely the main line where the grounding fault device is located, is tripped for protection, and the fault is eliminated.
The invention has the beneficial effects that compared with the prior art:
the invention can further perfect the processing mechanism of sudden faults in actual work by simulating the whole automatic detection, identification and processing process, and strengthen the capacity of processing the ground faults of the power distribution network line;
the device can realize automatic detection, identification and treatment of intermittent arc ground faults, has simple structure, and can judge the intermittent arc ground faults on the basis of the amplitude value and the phase of transient-like change in current and zero sequence voltage at a typical transient frequency; when the grounding fault is processed, the small resistor is put into operation, and the expansion of the fault caused by the fact that the arc suppression coil cannot compensate the large current when the capacitance current is large can be avoided.
Drawings
FIG. 1 is a block diagram of a simulation system for automatically detecting and handling intermittent arc-to-ground faults in accordance with the present invention;
wherein the reference numerals are as follows:
1-simulation system, 2-fault simulation device, 3-fault processing device, 4-data detection device, 5-ground fault device, 6-remote control device, S1-isolator, S2-control switch, S3-ground switch, R1-protection resistance.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
Fig. 1 is a block diagram of a simulation system for automatically detecting and handling intermittent arc-to-ground faults according to the present invention, and as shown in fig. 1, example 1 of the present invention provides a simulation system for automatically detecting and handling intermittent arc-to-ground faults, in a preferred but non-limiting embodiment of the present invention, the simulation system 1 includes a fault handling means 3, a data detecting means 4, and a fault simulating means 2;
the fault simulation device 2 is used for controlling a plurality of switches to simulate the occurrence and disappearance of intermittent arc ground faults so as to prepare for the simulation to be applied to an actual system in the future;
when the fault simulation device 2 simulates the intermittent arc ground fault, the ground fault can occur intermittently, and the data detection device 4 is required to continuously detect the zero sequence voltage, the phase current signal and the intermittent arc generated when the fault simulation device 2 simulates the intermittent arc ground fault, and judge in real time;
further preferably, the fault simulation apparatus 2 is structured as shown in fig. 1;
the fault simulation device 2 comprises an isolating switch S1, a control switch S2, a grounding switch S3, a protection resistor R1, a grounding fault device 5 and a remote control device 6;
one end of the ground fault device 5 is grounded, and the other end of the ground fault device is connected with the tail end of the protection resistor R1;
the head end of the protection resistor R1 is connected with the tail end of the control switch S2;
the head end of the control switch S2 is connected with the tail end of the isolating switch S1 and the head end of the grounding switch S3;
the tail end of the grounding switch S3 is grounded, and the head end of the isolating switch S1 is connected with the data monitoring device;
the remote control device 6 controls the opening and closing of the isolating switch S1, the control switch S2 and the grounding switch S3 to simulate the occurrence and disappearance of intermittent arc grounding faults.
Wherein, the head end of the simulated ground fault 5 is grounded in a ground fault mode through the tail end of the ground fault device 5, and the specific ground fault type is intermittent arc ground fault.
Before the operation of the entire simulation system 1, in order to avoid a corresponding malfunction due to a mishandling of the disconnector S1 when this simulation system 1 is not in use:
during the non-simulation process, the grounding switch S3 is in a closed state, so that the tail end of the isolating switch S1 is grounded;
during the simulation process, the grounding switch S3 is opened, the isolating switch S1 is closed, and normal simulation of intermittent arc grounding faults is ensured.
That is, before the operation of the simulation system 1, the switching states in the fault simulation apparatus 2 are:
the isolating switch S1 is in an open state, namely the head end and the tail end are separated, the control switch S2 is in an open state, namely the head end and the tail end are separated, a heavy guarantee is added for avoiding the occurrence of misoperation of intermittent electric arcs, and the grounding switch S3 is in a closed state, so that the tail end of the isolating switch S1 is grounded.
The remote control device 6 is used for controlling the opening and closing actions of the control switch S2, the isolating switch S1 and the grounding switch S3 so as to simulate the occurrence and disappearance of intermittent arc grounding faults.
When preparing to simulate an intermittent arc ground fault:
the remote control device 6 controls the isolating switch S1 to be closed, namely in an on state, controls the control switch S2 to be closed, namely in an on state, and controls the grounding switch S3 to be opened, namely in an off state, so as to simulate the intermittent arc grounding fault process;
after the simulated intermittent arc ground fault process is completed:
the remote control device 6 controls the disconnecting switch S1 to be opened, that is, in an off state, controls the control switch S2 to be opened, that is, in an off state, and controls the grounding switch S3 to be closed, that is, in an on state.
For the above-described simulation process, the occurrence and disappearance of the ground fault for the intermittent arc can be achieved by operating the remote control device 6.
The information generated by the fault simulation means 2 is further determined by the data detection means 4 as an intermittent arc-to-ground fault and further processed by the fault handling means 3.
The data detection device 4 is used for detecting the zero sequence voltage, the phase current signal and the intermittent arc generated when the intermittent arc ground fault is simulated by the fault simulation device 2 in real time, filtering the zero sequence voltage and the phase current signal according to the transient component in the intermittent arc, and judging the ground fault after obtaining the corresponding transient component;
the data detection device 4 detects intermittent arc ground faults, specifically:
the data detection device 4 detects the zero sequence voltage, the phase current signal and the intermittent arc generated when the fault simulation device 2 simulates the intermittent arc ground fault;
when the intermittent arc ground fault is simulated, the corresponding information is detected by the data detection device 4, and the fault is further determined to be the intermittent arc ground fault by analyzing the detected data such as zero sequence voltage, phase current and the like;
processing the measured current through a filter having a frequency of AHz, the current through the filter including almost only the amount of transients present in an intermittent arc-to-ground fault;
processing the measured voltage through a filter having a frequency of AHz, the voltage passing through the filter including almost only the amount of transients present in an intermittent arc-to-ground fault;
the zero sequence voltage transient amplitude values at a plurality of frequency points after being processed by the filter are recorded as U mi The phase angle is noted as omega i I=1, 2, ·k, k is the number of frequency bins;
the transient amplitude of the phase current at a plurality of frequency points after being processed by the filter is recorded as U mj The phase angle is noted as omega' j J=1, 2, ·k, k is the frequency point number;
taking y=c=j=i=1, 2, ·k, the data detection device 4 calculates and compares the phase current transient corresponding to the frequency points i, j with the zero sequence voltage transient as follows:
calculating the phase angle omega of the transient quantity of the phase current and the transient quantity of the zero sequence voltage c ，ω c ＝ω’ j- ω i ；
Amplitude U of zero sequence voltage transient mi With a preset amplitude U' mi Comparing;
amplitude U of current transient mj With a preset amplitude U' mj Comparing;
by taking the difference omega of the phase angles c With a preset value omega y Comparing;
in specific implementation, the preset value is a value obtained by selecting multipoint frequency random grouping, calculating and averaging after the intermittent arc ground fault is determined.
The intermittent arc-to-ground fault is discriminated based on the calculation and comparison results, and when the intermittent arc-to-ground fault is discriminated, a signal that is determined to be the intermittent arc-to-ground fault is sent to the fault processing device 3, specifically: if U occurs mi ＜U’ mi 、U mj ＜U’ mj Or omega c And when the arc grounding fault is within the preset range, judging that the intermittent arc grounding fault exists.
The fault processing device 3 is used for processing intermittent arc grounding faults by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel.
After receiving the signal which is sent by the data detection device 4 and is determined to be the intermittent arc grounding fault, the fault processing device 3 accesses the arc suppression coil grounding device into the main circuit where the grounding fault device 5 is positioned, and compensates the grounding capacitance current of the grounding fault device 5 by utilizing the arc suppression coil grounding device to limit the overvoltage of the system;
then the data detection device 4 continuously detects the signal of the fault simulation device 2, if the signal which is determined to be the intermittent arc grounding fault and is sent by the data detection device 4 disappears, namely the intermittent arc grounding fault is considered to be absent, the simulation system resumes normal operation, otherwise, the intermittent arc grounding fault still exists, and the fault cannot be eliminated through the compensation of the arc suppression coil grounding device, the fault is:
compensating the grounding power Rong Dianliu by adopting an arc suppression coil grounding device to suppress the overvoltage of the system;
and setting the compensation value and the limit value through parameters of a specific system and calculating related values of the arc suppression coil.
And then the small resistor grounding device is adopted to directly connect the small resistor with the bus, so that the grounding fault line, namely the main line where the grounding fault device 5 is positioned, is subjected to protection tripping, and the fault is eliminated.
In the simulation system of the invention, the actual fault processing device 3 is selected for corresponding fault processing.
Further preferably, the fault handling device 3 includes a small-resistance grounding device and an arc suppression coil grounding device connected in parallel to the same bus, and specifically:
two wires led out from the bus, one wire is connected with the arc suppression coil grounding device, and the other wire is connected with the small-resistance grounding device, and the wires led out from the two wires are connected in parallel.
The small resistance of the small resistance grounding device is 15-25Ω.
Example two
The invention discloses a simulation method for automatically detecting and processing intermittent arc ground faults, which comprises the following steps:
step 1, controlling a plurality of switches to simulate the occurrence and disappearance of intermittent ground faults;
and 2, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the intermittent arc grounding faults occur, carrying out filtering treatment on the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs, judging the grounding faults after obtaining corresponding transient components, and adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel to treat the intermittent arc grounding faults when the intermittent arc grounding faults are judged.
Further preferably, step 2 performs the following intermittent arc-to-ground fault detection operations:
step 21, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the ground fault of the simulated intermittent arcs occurs in real time;
when an instruction for simulating the intermittent arc ground fault is received, simulating the intermittent arc ground fault, measuring corresponding information, analyzing the measured data such as zero sequence voltage and phase current, and further determining that the fault is the intermittent arc ground fault;
step 22, setting the filter frequency as AHz, wherein AHz is the frequency of transient components in the intermittent arc, and the frequency is the frequency contained in the transient components after passing through the band-pass filter;
the passband of the bandpass filter selects an appropriate range;
processing the measured current through a filter having a frequency of AHz, the current through the filter including almost only the amount of transients present in an intermittent arc-to-ground fault;
processing the measured voltage through a filter having a frequency of AHz, the voltage passing through the filter including almost only the amount of transients present in an intermittent arc-to-ground fault;
the zero sequence voltage transient amplitude values at a plurality of frequency points after being processed by the filter are recorded as U mi The phase angle is noted as omega i I=1, 2, ·k, k is the number of frequency bins;
the transient amplitude of the phase current at a plurality of frequency points after being processed by the filter is recorded as U mj The phase angle is noted as omega' j J=1, 2, ·k, k is the frequency point number;
step 24, taking y=c=j=i=1, 2,..k, and calculating and comparing the phase current transient quantity and the zero sequence voltage transient quantity corresponding to the frequency points i and j as follows:
calculating the phase angle omega of the transient quantity of the phase current and the transient quantity of the zero sequence voltage c ，ω c ＝ω’ j- ω i ；
Amplitude U of zero sequence voltage transient mi With a preset amplitude U' mi Comparing;
amplitude U of current transient mj With a preset amplitude U' mj Comparing;
by taking the difference omega of the phase angles c With a preset value omega y Comparing;
in specific implementation, the preset value is a value obtained by selecting multipoint frequency random grouping, calculating and averaging after the intermittent arc ground fault is determined.
Step 25, judging an intermittent arc ground fault according to the calculation and comparison results of step 24, and when judging the intermittent arc ground fault, sending a signal which is determined to be the intermittent arc ground fault, specifically: if U occurs mi ＜U’ mi 、U mj ＜U’ mj Or omega c And when the arc grounding fault is within the preset range, judging that the intermittent arc grounding fault exists.
Further, a signal determined to be an intermittent arc ground fault is transmitted in a high level form;
the preset range is set to-170 deg. to 10 deg..
In the step 2, the intermittent arc grounding fault is processed by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel.
After receiving the signal determined to be an intermittent arc ground fault, the following steps are performed:
1) The arc suppression coil grounding device is connected to a main circuit where the grounding fault device 5 is, and the arc suppression coil grounding device is used for compensating the grounding capacitance current of the grounding fault device 5 to limit the overvoltage of the system;
2) Continuously detecting a signal when the intermittent arc ground fault is simulated, if the signal which is determined to be the intermittent arc ground fault is disappeared, namely the intermittent arc ground fault is considered to be absent, the simulation system resumes normal operation, otherwise, the intermittent arc ground fault is represented to be still present, and the fault cannot be eliminated through the compensation of the arc suppression coil grounding device, and then:
compensating the grounding power Rong Dianliu by adopting an arc suppression coil grounding device to suppress the overvoltage of the system;
and setting the compensation value and the limit value through parameters of a specific system and calculating related values of the arc suppression coil.
And then the small resistor grounding device is adopted to directly connect the small resistor with the bus, so that the grounding fault line, namely the main line where the grounding fault device 5 is positioned, is subjected to protection tripping, and the fault is eliminated.
The invention has the beneficial effects that compared with the prior art:
according to the invention, the intermittent arc grounding faults are simulated, zero sequence voltage and phase current signals generated when the intermittent grounding faults occur are detected, the zero sequence voltage and phase current signals are subjected to filtering treatment according to transient frequency in the intermittent arc, the grounding faults are judged after corresponding transient quantity is obtained, and the intermittent grounding faults are treated by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel, so that the simulation of the whole automatic detection, identification and treatment process is realized, the treatment mechanism of the sudden faults in actual work can be further perfected, and the capability of treating the grounding faults of a power distribution network line is enhanced;
the device can realize automatic detection, identification and treatment of intermittent arc ground faults, has simple structure, and can judge the intermittent arc ground faults on the basis of the amplitude value and the phase of transient-like change in current and zero sequence voltage at a typical transient frequency; when the grounding fault is processed, the small resistor is put into operation, and the expansion of the fault caused by the fact that the arc suppression coil cannot compensate the large current when the capacitance current is large can be avoided.
While the applicant has described and illustrated the present invention in detail in connection with the drawings of the specification, it should be understood by those skilled in the art that the foregoing examples are merely preferred embodiments of the present invention, and the detailed description is provided to assist the reader in understanding the spirit of the invention and is not intended to limit the scope of the invention. On the contrary, any improvement or modification based on the spirit of the invention should fall within the scope of the invention. The structures, amounts, etc. shown in the drawings are for understanding and reading only those structures, amounts, etc. that are shown in the drawings are for understanding and are not to be construed as limiting the invention, and thus, any structural modification, quantitative change, or adjustment of size should fall within the scope of the invention without affecting the efficacy or achievement of the present invention. Also, the terms such as "first," "not" and the like recited in the present specification are merely for convenience of description and are not intended to limit the scope of the invention, which is defined by the appended claims, but rather by the following claims.
Claims (5)
1. A simulation system for automatically detecting and handling intermittent arc-to-ground faults, comprising:
the simulation system (1) comprises a fault simulation device (2), a fault processing device (3) and a data detection device (4);
the fault simulation device (2) is used for controlling the plurality of switches to simulate the occurrence and disappearance of intermittent ground faults;
the fault simulation device (2) comprises an isolating switch (S1), a control switch (S2), a grounding switch (S3), a protection resistor (R1), a grounding fault device (5) and a remote control device (6);
the head end of the protection resistor (R1) is connected with the tail end of the control switch (S2);
one end of the ground fault device (5) is grounded, and the other end of the ground fault device is connected with the tail end of the protection resistor (R1);
the head end of the control switch (S2) is connected with the tail end of the isolating switch (S1) and the head end of the grounding switch (S3);
the tail end of the grounding switch (S3) is grounded, and the head end of the isolating switch (S1) is connected with the data detection device (4);
the remote control device (6) controls the opening and closing of the isolating switch (S1), the control switch (S2) and the grounding switch (S3) to simulate the occurrence and disappearance of intermittent arc grounding faults;
before the simulation system (1) operates, the switching state in the fault simulation device (2) is as follows:
the isolating switch (S1) is in an open state, the control switch (S2) is in an open state, the grounding switch (S3) is in a closed state, and the tail end of the isolating switch (S1) is grounded;
in the fault simulation device (2), when an intermittent arc grounding fault is to be simulated, the remote control device (6) is used as an initial action device to control the closing of the isolating switch (S1), control the closing of the control switch (S2) and control the opening of the grounding switch (S3) so as to simulate the progress of the intermittent arc grounding fault;
when the intermittent arc grounding fault simulation process is completed, the remote control device (6) controls the disconnecting switch (S1) to be opened, the control switch (S2) to be opened and the grounding switch (S3) to be closed;
the data detection device (4) is used for detecting zero sequence voltage, phase current signals and intermittent arcs generated when the intermittent arc ground fault occurs, performing filtering processing on the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs, obtaining corresponding transient values, and then performing ground fault judgment, and is specific:
setting the filter frequency as AHz, wherein AHz is the frequency of transient components in intermittent electric arcs, and the frequency is the frequency contained in the transient components after passing through a band-pass filter;
the filter filters zero sequence voltage and phase current signals, wherein the phase current passing through the filter only contains the transient quantity appearing in the intermittent arc ground fault;
the zero sequence voltage transient amplitude value at the frequency point i after being processed by the filter is recorded as U mi The phase angle is noted as omega i I=1, 2, ·k, k is the number of frequency bins;
the transient amplitude of the phase current at the frequency point j after being processed by the filter is recorded as I mj The phase angle is noted as omega' j J=1, 2, ·k, k is the frequency point number;
taking y=c=j=i=1, 2, ·k, the phase current transient corresponding to the frequency points i, j is calculated and compared with the zero sequence voltage transient as follows:
calculating the phase angle omega of the transient quantity of the phase current and the transient quantity of the zero sequence voltage c I.e. calculating ω c ＝ω’ j -ω i ；
Amplitude U of zero sequence voltage transient mi With a preset amplitude U' mi Comparing;
amplitude I of transient quantity of current mj With a preset amplitude I' mj Comparing;
by taking the difference omega of the phase angles c With a preset value omega y Comparing;
if U appears in the calculation and comparison results mi ＜U’ mi 、I mj ＜I’ mj Or omega c If the arc grounding fault is within the preset range, judging that the intermittent arc grounding fault exists;
and the fault processing device (3) is used for processing the intermittent arc grounding fault by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel when the data detection device (4) judges the intermittent arc grounding fault.
2. A simulation system for automatically detecting and handling intermittent arc-to-ground faults according to claim 1, wherein:
in the fault processing device (3), the small resistance value of the small-resistance grounding device is 15-25Ω.
3. A simulation method for automatically detecting and handling intermittent arc-to-ground faults, employing the simulation system for automatically detecting and handling intermittent arc-to-ground faults as claimed in claim 1 or 2, characterized in that:
the method comprises the following steps:
step 1, controlling a plurality of switches to simulate the occurrence and disappearance of intermittent ground faults;
step 2, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the intermittent arc grounding faults occur, carrying out filtering treatment on the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs, judging the grounding faults after obtaining corresponding transient components, and adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel to process the intermittent arc grounding faults when the intermittent arc grounding faults are judged;
step 2, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the intermittent arc ground faults occur, and performing filtering processing on the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs to obtain corresponding transient quantities, and then performing ground fault judgment, wherein the method specifically comprises the following steps:
step 21, detecting zero sequence voltage, phase current signals and intermittent arcs generated when the ground fault of the simulated intermittent arcs occurs in real time;
step 22, setting the filter frequency as AHz, wherein AHz is the frequency of transient components in the intermittent arc, and the frequency is the frequency contained in the transient components after passing through the band-pass filter;
step 23, filtering the zero sequence voltage and phase current signals by a filter, wherein the phase current passing through the filter only comprises the transient quantity appearing in the intermittent arc ground fault;
the zero sequence voltage transient amplitude value at the frequency point i after being processed by the filter is recorded as U mi The phase angle is noted as omega i I=1, 2, ·k, k is the number of frequency bins;
the transient amplitude of the phase current at the frequency point j after being processed by the filter is recorded as I mj The phase angle is noted as omega' j J=1, 2, ·k, k is the number of frequency bins;
step 24, taking y=c=j=i=1, 2,..k, and calculating and comparing the phase current transient quantity and the zero sequence voltage transient quantity corresponding to the frequency points i and j as follows:
calculating the phase angle omega of the transient quantity of the phase current and the transient quantity of the zero sequence voltage c ，ω c ＝ω’ j -ω i ；
Amplitude U of zero sequence voltage transient mi With a preset amplitude U' mi Comparing;
amplitude I of transient quantity of current mj With a preset amplitude I' mj Comparing;
by taking the difference omega of the phase angles c With a preset value omega y Comparing;
step 25, judging an intermittent arc grounding fault according to the calculation and comparison results of the step 24, and transmitting a signal which is determined to be the intermittent arc grounding fault when the intermittent arc grounding fault is judged;
in step 25, if U appears in the calculation and comparison results of step 24 mi ＜U’ mi 、I mj ＜I’ mj Or omega c And if the arc-to-ground fault is within the preset range, judging that the intermittent arc-to-ground fault exists.
4. A simulation method for automatically detecting and handling intermittent arc-to-ground faults according to claim 3, wherein:
in step 2, after receiving the signal determined to be an intermittent arc ground fault, the following steps are performed:
1) The arc suppression coil grounding device is connected to a main circuit where the grounding fault device (5) is located, and the arc suppression coil grounding device is used for compensating the grounding capacitance current of the grounding fault device (5) to limit the overvoltage of the system;
2) Continuously detecting signals when the intermittent arc grounding faults are simulated, if the signals determined to be the intermittent arc grounding faults disappear, namely, the intermittent arc grounding faults are considered to be absent, the simulation system resumes normal operation, otherwise, the simulation system indicates that the intermittent arc grounding faults still exist, the faults cannot be eliminated through compensation of the arc suppression coil grounding device, and then the small-resistance grounding device is introduced to eliminate the faults.
5. A simulation method for automatically detecting and handling intermittent arc-to-ground faults as claimed in claim 4, wherein:
in the step 2), when the fault cannot be eliminated by the arc suppression coil grounding device, the arc suppression coil grounding device is adopted to compensate the grounding electricity Rong Dianliu to suppress the overvoltage of the system, and then the small resistance grounding device is adopted to directly connect the small resistance with the bus, so that the grounding fault line, namely the main line where the grounding fault device (5) is located, is tripped for protection, and the fault is eliminated.
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